Aquarium
FIG. 1 is a front elevational view of an aquarium showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a bottom plan view thereof; 
     FIG. 4 is a rear elevational view thereof; and 
     FIG. 5 is a right side elevational view thereof. 
     The broken line representation of fish and plants in FIGS. 1 and 4 is for illustrative purposes only and forms no part of the claimed design.